Electrical and Mechanical Power
Why in dynamic analysis of machine when plotting, electrical power response is greater than the mechanical power?
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2 answers
The dynamic process is caused by the difference between electrical power and mechanical power. If the electrical power and mechanical power are equal, there will no dynamic process.
The difference is due to the convention used in dynamics simulation output (see list of output signals in Table 14-2 in PSS/E V32 Operation Manual). Mechanical power is given in pu on machine MVA base (MBASE) while electrical power is expressed on system MVA base (SYSMVA=100 MVA by default). For example, a 500 MVA machine with 0.8 pu mechanical power (i.e. 0.8x500=400 MW) will have electrical power equal to 4 pu (on 100 MVA basis), if losses are neglected.
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Asked: 2016-03-30 03:41:23 -0500
Seen: 1,940 times
Last updated: Apr 14 '16
